//------------------------------------------------------------------------
// Compiler::unwindEmitFuncHelper: Report the unwind information to the VM for a
// given main function or funclet, for either the hot or cold section.
//
// Arguments:
// func - The main function or funclet to reserve unwind info for.
// pHotCode - Pointer to the beginning of the memory with the function and funclet hot code.
// pColdCode - Pointer to the beginning of the memory with the function and funclet cold code.
// Ignored if 'isHotCode' is true.
// isHotCode - 'true' to report the hot section, 'false' to report the cold section.
//
void Compiler::unwindEmitFuncHelper(FuncInfoDsc* func, void* pHotCode, void* pColdCode, bool isHotCode)
{
UNATIVE_OFFSET startOffset;
UNATIVE_OFFSET endOffset;
DWORD unwindCodeBytes = 0;
BYTE* pUnwindBlock = nullptr;
if (isHotCode)
{
if (func->startLoc == nullptr)
{
startOffset = 0;
}
else
{
startOffset = func->startLoc->CodeOffset(genEmitter);
}
if (func->endLoc == nullptr)
{
endOffset = info.compNativeCodeSize;
}
else
{
endOffset = func->endLoc->CodeOffset(genEmitter);
}
#ifdef UNIX_AMD64_ABI
if ((opts.eeFlags & CORJIT_FLG_CFI_UNWIND) != 0)
{
int size = func->cfiCodes->size();
if (size > 0)
{
unwindCodeBytes = size * sizeof(CFI_CODE);
pUnwindBlock = (BYTE*)&(*func->cfiCodes)[0];
}
}
else
#endif // UNIX_AMD64_ABI
{
unwindCodeBytes = sizeof(func->unwindCodes) - func->unwindCodeSlot;
#ifdef DEBUG
UNWIND_INFO * pUnwindInfo = (UNWIND_INFO *)(&func->unwindCodes[func->unwindCodeSlot]);
DWORD unwindCodeBytesSpecified = offsetof(UNWIND_INFO, UnwindCode) + pUnwindInfo->CountOfUnwindCodes * sizeof(UNWIND_CODE); // This is what the unwind codes themselves say; it better match what we tell the VM.
assert(unwindCodeBytes == unwindCodeBytesSpecified);
#endif // DEBUG
pUnwindBlock = &func->unwindCodes[func->unwindCodeSlot];
}
}
else
{
assert(fgFirstColdBlock != nullptr);
assert(func->funKind == FUNC_ROOT); // No splitting of funclets.
if (func->coldStartLoc == nullptr)
{
startOffset = 0;
}
else
{
startOffset = func->coldStartLoc->CodeOffset(genEmitter);
}
if (func->coldEndLoc == nullptr)
{
endOffset = info.compNativeCodeSize;
}
else
{
endOffset = func->coldEndLoc->CodeOffset(genEmitter);
}
}
#ifdef DEBUG
if (opts.dspUnwind)
{
#ifdef UNIX_AMD64_ABI
if ((opts.eeFlags & CORJIT_FLG_CFI_UNWIND) != 0)
{
DumpCfiInfo(isHotCode, startOffset, endOffset, unwindCodeBytes, (const CFI_CODE * const)pUnwindBlock);
}
else
#endif // UNIX_AMD64_ABI
{
DumpUnwindInfo(isHotCode, startOffset, endOffset, (const UNWIND_INFO * const)pUnwindBlock);
}
}
#endif // DEBUG
// Adjust for cold or hot code:
// 1. The VM doesn't want the cold code pointer unless this is cold code.
// 2. The startOffset and endOffset need to be from the base of the hot section for hot code
// and from the base of the cold section for cold code
if (isHotCode)
{
assert(endOffset <= info.compTotalHotCodeSize);
pColdCode = nullptr;
}
else
{
assert(startOffset >= info.compTotalHotCodeSize);
startOffset -= info.compTotalHotCodeSize;
endOffset -= info.compTotalHotCodeSize;
}
eeAllocUnwindInfo((BYTE*)pHotCode,
(BYTE*)pColdCode,
startOffset,
endOffset,
unwindCodeBytes,
pUnwindBlock,
(CorJitFuncKind)func->funKind);
}
void Compiler::unwindEmitFuncCFI(FuncInfoDsc* func, void* pHotCode, void* pColdCode)
{
UNATIVE_OFFSET startOffset;
UNATIVE_OFFSET endOffset;
DWORD unwindCodeBytes = 0;
BYTE* pUnwindBlock = nullptr;
if (func->startLoc == nullptr)
{
startOffset = 0;
}
else
{
startOffset = func->startLoc->CodeOffset(genEmitter);
}
if (func->endLoc == nullptr)
{
endOffset = info.compNativeCodeSize;
}
else
{
endOffset = func->endLoc->CodeOffset(genEmitter);
}
DWORD size = (DWORD)func->cfiCodes->size();
if (size > 0)
{
unwindCodeBytes = size * sizeof(CFI_CODE);
pUnwindBlock = (BYTE*)&(*func->cfiCodes)[0];
}
#ifdef DEBUG
if (opts.dspUnwind)
{
DumpCfiInfo(true /*isHotCode*/, startOffset, endOffset, unwindCodeBytes, (const CFI_CODE* const)pUnwindBlock);
}
#endif // DEBUG
assert(endOffset <= info.compTotalHotCodeSize);
eeAllocUnwindInfo((BYTE*)pHotCode, nullptr /* pColdCode */, startOffset, endOffset, unwindCodeBytes, pUnwindBlock,
(CorJitFuncKind)func->funKind);
if (pColdCode != nullptr)
{
assert(fgFirstColdBlock != nullptr);
assert(func->funKind == FUNC_ROOT); // No splitting of funclets.
unwindCodeBytes = 0;
pUnwindBlock = nullptr;
if (func->coldStartLoc == nullptr)
{
startOffset = 0;
}
else
{
startOffset = func->coldStartLoc->CodeOffset(genEmitter);
}
if (func->coldEndLoc == nullptr)
{
endOffset = info.compNativeCodeSize;
}
else
{
endOffset = func->coldEndLoc->CodeOffset(genEmitter);
}
#ifdef DEBUG
if (opts.dspUnwind)
{
DumpCfiInfo(false /*isHotCode*/, startOffset, endOffset, unwindCodeBytes,
(const CFI_CODE* const)pUnwindBlock);
}
#endif // DEBUG
assert(startOffset >= info.compTotalHotCodeSize);
startOffset -= info.compTotalHotCodeSize;
endOffset -= info.compTotalHotCodeSize;
eeAllocUnwindInfo((BYTE*)pHotCode, (BYTE*)pColdCode, startOffset, endOffset, unwindCodeBytes, pUnwindBlock,
(CorJitFuncKind)func->funKind);
}
}
